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A $2 m$ high person is holding a $25 kg$ trunk on his head and is standing at a roadway’s bus-terminus. How much work is done by the person?

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0 J

50 J

25 J

500 J

answer is A.

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Detailed Solution

The

2 m

high person who is holding a

25 kg

trunk does not work standing at the bus-terminus.
Work done is calculated by the formula,

W = F \times s

Here,

F =

Force is exerted by the man on the trunk.

s =

Displacement of the trunk in the direction of applied force.
Since there is no displacement. S becomes

0

, then

W = F \times 0

= 0

Work done becomes

0

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